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package spartan
import (
"bufio"
"errors"
"io"
"net/url"
"strconv"
"strings"
"tildegit.org/tjp/sliderule/internal/types"
)
var (
// InvalidRequestLine indicates a malformed first-line of a spartan request.
InvalidRequestLine = errors.New("invalid request line")
// InvalidRequestLineEnding says that a spartan request's first line wasn't terminated with CRLF.
InvalidRequestLineEnding = errors.New("invalid request line ending")
)
// ParseRequest parses a single spartan request and the indicated content-length from a reader.
//
// If ther reader artument is a *bufio.Reader, it will only read a single line from it.
func ParseRequest(rdr io.Reader) (*types.Request, int, error) {
bufrdr, ok := rdr.(*bufio.Reader)
if !ok {
bufrdr = bufio.NewReader(rdr)
}
line, err := bufrdr.ReadString('\n')
if err != io.EOF && err != nil {
return nil, 0, err
}
host, rest, ok := strings.Cut(line, " ")
if !ok {
return nil, 0, InvalidRequestLine
}
path, rest, ok := strings.Cut(rest, " ")
if !ok {
return nil, 0, InvalidRequestLine
}
if len(rest) < 2 || line[len(line)-2:] != "\r\n" {
return nil, 0, InvalidRequestLineEnding
}
contentlen, err := strconv.Atoi(rest[:len(rest)-2])
if err != nil {
return nil, 0, err
}
return &types.Request{
URL: &url.URL{
Scheme: "spartan",
Host: host,
Path: path,
RawPath: path,
},
Meta: &io.LimitedReader{R: bufrdr, N: int64(contentlen)},
}, contentlen, nil
}
// GetRequestContentLength reads the remaining un-read number of bytes in a request body.
//
// It will immediately return 0 if there is no request body.
func GetRequestContentLength(request *types.Request) int {
if lr, ok := request.Meta.(*io.LimitedReader); ok {
return int(lr.N)
}
return 0
}
// GetRequestBody returns a reader of the spartan request body.
//
// It will return nil if the request has no body.
func GetRequestBody(request *types.Request) io.Reader {
if rdr, ok := request.Meta.(io.Reader); ok {
return rdr
}
return nil
}
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